6-layer immersion gold E-paper main board pcb 1)Base material:FR-4 2 ... ROHS,REACH,IS 6-layer immersion gold E-paper main board pcb1)Base material:FR-42)Surface Finish : ... HAL3)Certificate:UL,ROHS,REACH,ISO9001,T/S169494)board thickness:1.6mm5)Min hole size:0.3 ... /IMMERSION GOLD, OSPSOLDER MASK COLORGREEN, BLUE, BLACK, WHITE,REDTECHNNOLOGYBLOCK,BGA,PEELABLE,CARBON INKASSEMBLYLEAD FREE,NOT LEAD FREELEGEND ...